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Problem: Three charges are arranged along the x-axis: +q at x = -2d; +2q at x = d; –4q at x = 2d. Which expression gives the magnitude of the electric field at the origin (x = 0)? In the expressions below, the constant 1/(4πϵ0) has been replaced with k. A. 5kq / 4d2 B. 11kq / 4d2 C. 13kq / 4d2 D. 3kq / 4d2

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Problem Details

Three charges are arranged along the x-axis: +q at x = -2d; +2q at x = d; –4q at x = 2d. Which expression gives the magnitude of the electric field at the origin (x = 0)? In the expressions below, the constant 1/(4πϵ0) has been replaced with k.

A. 5kq / 4d2

B. 11kq / 4d2

C. 13kq / 4d2

D. 3kq / 4d2

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